GPU through CD sata port

Yes, it is possible Though, I'll also say that I don't think any of my motherboards have an option to force the slots to SATA mode Reading

How Version of SATA Ports written on Motherboard and What they Mean?

sata 3 slot YES, you can use both SATA and eSATA ports with an eSATA bracket No problem there As for the rest, the ability to safely remove

sata m2 slot The closest port to the PCB is the odd number However it doesn't really matter I don't think SATA 0 and 1 are provided from